programming-examples/java/Computer_Graphics/Matrix.java

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Java
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2019-11-15 12:59:38 +01:00
public class Matrix {
double data[][] = new double[4][4];
double multiplyTemp[][] = new double[4][4];
double temp[][] = new double[4][4];
// basic operation
public void set(int i, int j, double value) { // Set one value
data[i][j] = value;
}
public double get(int i, int j) { // Get one value
return data[i][j];
}
public void copy(Matrix src) { // copy Matrix
for (int row = 0 ; row < 4 ; row++)
for (int col = 0 ; col < 4 ; col++)
data[row][col] = src.get(row,col);
}
public void createIdentityData(double dst[][]) {
for (int row = 0 ; row < 4 ; row++) {
for (int col = 0 ; col < 4 ; col++) {
if (row == col)
dst[row][col] = 1;
else
dst[row][col] = 0;
}
}
}
public void createHermiteData(double dst[][]) {
dst[0][0] = 2; dst[0][1] = -2; dst[0][2] = 1; dst[0][3] = 1;
dst[1][0] = -3; dst[1][1] = 3; dst[1][2] = -2; dst[1][3] = -1;
dst[2][0] = 0; dst[2][1] = 0; dst[2][2] = 1; dst[2][3] = 0;
dst[3][0] = 1; dst[3][1] = 0; dst[3][2] = 0; dst[3][3] = 0;
}
public void createTranslationData(double a, double b, double c, double dst[][]) {
createIdentityData(dst);
dst[0][3] = a;
dst[1][3] = b;
dst[2][3] = c;
}
public void createXRotationData(double theta, double dst[][]) {
createIdentityData(dst);
dst[1][1] = Math.cos(theta);
dst[1][2] = -Math.sin(theta);
dst[2][1] = Math.sin(theta);
dst[2][2] = Math.cos(theta);
}
public void createYRotationData(double theta, double dst[][]) {
createIdentityData(dst);
dst[0][0] = Math.cos(theta);
dst[0][2] = Math.sin(theta);
dst[2][0] = -Math.sin(theta);
dst[2][2] = Math.cos(theta);
}
public void createZRotationData(double theta, double dst[][]) {
createIdentityData(dst);
dst[0][0] = Math.cos(theta);
dst[0][1] = -Math.sin(theta);
dst[1][0] = Math.sin(theta);
dst[1][1] = Math.cos(theta);
}
public void createScaleData(double x, double y, double z, double dst[][]) {
createIdentityData(dst);
dst[0][0] = x;
dst[1][1] = y;
dst[2][2] = z;
}
public void createPerspectData(double f, double dst[][]) {
createIdentityData(dst);
dst[3][2] = -1.0/f;
}
public void multiply(Matrix src) {
multiply(src.data);
}
public void multiply(double src[][]) {
// FIRST COPY MY ORIGINAL DATA TO A TEMPORARY LOCATION
for (int row = 0 ; row < 4 ; row++)
for (int col = 0 ; col < 4 ; col++)
multiplyTemp[row][col] = data[row][col];
// USE TEMP TO DO THE MATRIX MULTIPLICATION
for (int row = 0 ; row < 4 ; row++) {
for (int col = 0 ; col < 4 ; col++) {
data[row][col] = 0;
for (int i = 0 ; i < 4 ; i++)
data[row][col] += multiplyTemp[row][i] * src[i][col];
}
}
}
public void identity() {
createIdentityData(data);
}
public void hermiteMatrix() {
createHermiteData(data);
}
public void translate(double a, double b, double c) {
createTranslationData(a,b,c,temp);
multiply(temp);
}
public void rotateX(double theta) {
createXRotationData(theta, temp);
multiply(temp);
}
public void rotateY(double theta) {
createYRotationData(theta, temp);
multiply(temp);
}
public void rotateZ(double theta) {
createZRotationData(theta, temp);
multiply(temp);
}
public void scale(double x, double y, double z) {
createScaleData(x, y, z, temp);
//printMatrix(temp);
multiply(temp);
}
public void perspect(double f) {
createPerspectData(f, temp);
multiply(temp);
}
public void transform(double src[], double dst[]) {
for (int row = 0 ; row < dst.length ; row++) {
dst[row] = 0;
for (int i = 0 ; i < src.length ; i++)
dst[row] += data[row][i] * src[i];
}
}
public void printMatrix(Matrix src) {
printMatrix(src.data);
}
public void printMatrix(double v[]) {
for (int i = 0; i < v.length; i++)
System.out.print(v[i]+"\t");
System.out.println();
}
public void printMatrix(double m[][]) {
for (int i = 0; i<m.length; i++) {
for (int j = 0; j<m[i].length; j++) {
System.out.print(m[i][j]+"\t");
}
System.out.println();
}
}
public void printMatrix(int m[][]) {
for (int i = 0; i<m.length; i++) {
for (int j = 0; j<m[i].length; j++) {
System.out.print(m[i][j]+"\t");
}
System.out.println();
}
}
}